Air-filter.



M. BRAUBR.

AIR FILTER. APPLICATION FILED AUG. 4, 1913.

. Patented Apr. 28, 1914. 2 SHEETS-SHEET 1.

M. BRAUER.

AIR FILTER.

APPLICATION FILED AUG. 4, 1913.

1,094,521 Patented Apr. 28, 1914.

2 SHEETS-SHEET 2.

ares PATENT oFmcn.

MAX BRAUER, OF- BERLIN-WILMERSDORF, GERMANY, ASSIGNOR TO THE FIRM 0F DIR. HANS QRUSE & (30.,

OF BERLIN, GERMANY.

AIR-FILTER.

Specification of Letters Patent.

' Patentedgtpr. 28, 19114.

Application filed August 4, 1913. Serial No. 782,906.

To all whom it may concern:

Be it known that I, Max Bremen, a

citizen of the Empire of Germany, residing at Kulmbacherstrasse 12, Berlin-vVilmersdorf, Germany, have invented certain new and useful Improvements in Air-Filters, of which the following is va specification;

My invention relates to improvements in air filters, and more particularly in air filters of the class in which the filtering elements are provided by ropes or cords having a fibrous or rough surface and disposed one beside the other at suitable distances apart.

And the object of the improvements is to provide a filter of this class in which the dust is thoroughly separated from the air.

With this object in view my invention consists in displacing corresponding cords or ropes of successive elements from. each other in the direction of the pat-h of the air, so that the currents of air after passing between adjacent ropes of one element strike against ropes or cords of the following element, so as to be deflected thereby and to get into thorough contact with the ropes or cor'ds.

For the purpose of explaining the invention several examples embodying the same have been shown inthe accompanying drawing. in which the same letters of reference have been used in all the views to'indicate corresponding parts.-

In said drawing Figure 1, is a perspective view of the filtering apparatusshowing the casing of the filtering apparatus open and a part of the filtering elements in position and each filled with a suitable number of filtering elements, Fig. 3, is a side elevation of the filtering apparatus shown in Fig. 2

partly in section, Fig. 4 is an enlarged end view of a filtering element, Fig. 5 is a planview of a modification of the filtering elebe opened for which purpose it is hinged to the body of the casing a. At the inlet end the casing a is provided with a metal screen Z to prevent larger bodies from getting access to the filtering elements. At the inlet and outlet the casing a is provided with inlet and outlet studs 7) and c constructed in the form of funnels. In the example shown in Figs. 1 to 4' the filtering elements are constructed of rectangularframes made from iron bars f of T-shaped cross-section, the web portions 9 of two bars 0 and 3) located at opposite sides of the frame being provided with indentations h. In the latter a cord or rope 2' is inserted which is passed over the opposing bars 0 and p of the frame in zig-zag.

In the preferred form shown in the figures the indentations are made in such a way, that the parts 7: which hold the rope or. cord have a dovetailedor similar form, so that the rope can not slip oft. The rope or cord 2' has a rough or fibrous surface.

The rope or cord sections of adjacent filtering elements are displaced from each other in the direction of the longitudinal axis of the casing. This may be done in different ways. As shown it is done in such a way,- that frames of the same construction can be used for all the filtering elements. For this purpose the ropes are passed over the frames in an unsymmetrical Way, the frames having at one side spaces 9 for the passage of air and at the opposite side ropes or cords 1 which are directly in contact with the adjacent side bars of the frames. In the casing adjacent filtering elements are turned upside down relatively to each other,

so-that in one element the space 9 is located- .of the elements the; frame bars are made from iron bars'which have a Web at opposite sides, each of the said webs beingv made with indentations for receivingthe rope or cord. Preferably the ropes of the layers of each frame are displaced from each other in the manner described with reference to Fi s. l to 4. Also in this case all the elements ave the same construction, but the successive elements are not turned upside down relatively to each other. As shown the indentations s of the web t are displaced relativel to the indentations u of the Web '0, so that t e ropes w of one layer cover the spaces 4c provided by the ropes 3/ of the other layer. By providing similar frames of this construction the air must follow a zig-zag path through the filter. The opposite sides of the frame may be covered by a continuous rope.

"While in describing the invention reference has been made to particular embodiments thereof, I wish it to be understood that my invention is not limited to the constructions shown in the drawings, and that various changes may be made in the general construction and arrangement ofthe parts without departing from the gist of my invention. For example it is not necessary to provide displaced ropes or cords in the manner described herein, and it is not necessary, to have vthe ropes of successive layers arranged parallel to each other, provided that the said ropes areadapted to deflect the air from the straight path or to force the particles thereof to get in contact with the ropes. I claim herein as my invention: 1. In an apparatus for separating dust from gaseous fluids, the combination with a casing, of a plurality of filtering elements within said casing each formed of sets of spaced and adjacent ropes or cords, the ropes or cords of successive sets being displaced from each other transversely of the direction of the path of the fluid.

A filtering element, comprising a frame, and ropes or cords having a rough or fibrous surface secured to said frame in zig-zag on both sides thereof.

3. A filtering element,comprising a frame, and ropes or cords having a rough or fibrous surface secured to said frame in zig-zag on both sides thereof, the ropes of one side being displaced from the ropes of the other 51 e.

4. A filtering element, comprising a frame constructed-of iron bars having Webs projecting to opposite sides of the plane of the frame and formed with indentations, and

and ropes or cords having a rough or fibrous on both sides of the frame and passed in zig-zag over the area of the frame, the ropes of one side being displaced from those of the opposite side.

5. A filtering element, comprising a frame, and ropes or c ords having a rougher fibrous surface secured to said frame and arranged in several layers.

In testnnony whereof I afiix my signature in presence of two witnesses.

MAX BRAUER.

\Vitnesses WOLDEMAR 'HAUPT, HENRY HASPER. 

